Diamond mounting for abrasive wheel forming device



Um. 18, 1955 F. o. HOAGLAND DIAMOND MOUNTING FOR ABRASIVE WHEEL.F'ORMING DEVICE Filed March 6 1951 Ill-l will! si d1!!! ,4, u

United States Patent DIAMND MUNTNG F R ABRASIVE WHEEL FORMING DEVICEFrank 0. Hoagland, West Hartford, Conn., assignor to Niies-Bement-PondCompany, West Hartford, Conn., a corporation of New Jersey ApplicationMarch 6, 1951, Serial No. 214,165 2 Claims. (Cl. 12S- 11) This inventionrelates to abrasive wheel dressing or forming devices and moreparticularly to a diamond mounting member for a pantograph type tracingdevice adapted for forming the work engaging surface of an abrasivewheel to a predetermined contour.

An object of the present invention is to provide on one of the links ofa pantograph tracing deviceV a p'air of diamonds spaced slightly apartand movable over the Work engaging surface of the wheel, one diamondbeing usable for the rough forming operations, and the second diamondused for linal or finish forming an'd redressing the work engagingsurface of the abrasive wheel.

A feature of importance of the invention is that the diamonds aremounted within a suitable block or member secured to or forming the endof one of the pantograph linkage members, the points of the diamondbeing aligned with the axis of oscillation of the link, one of the otherlinks of the pantograph linkage being traced over the surface of atemplate having the desired contour, the axis of one of the diamondsbeing preferably iixed in position within the block and the second, orcompanion, diamond being so mounted that adjustment laterally to aslight degree is permitted relative to the lirst diamond; also,preferably the two diamonds are independently adjusted axially to bringtheir ends into alignment with the axis of oscillation of the link. v

Another feature of importance is that the wheel dressing ends of thediamonds, when in their properly adjusted positions, are both inalignment with the axis of oscillation of the pantograph lever on whichthey are mounted, and also are in alignment with the direction ofmovement of the work table on which the forming or dressing device ismounted.

With the above and other objects in view, the invention may include thefeatures of construction and operation set forth in the followingspecification and illustrated in the accompanying drawing.

In the accompanying drawing annexed hereto and forming a part of thisspecification, I have shown the invention embodied in a pantograph typetemplate tracing forming device for abrasive wheels, but it will beunderstood that the invention can be otherwise embodied and the drawingis not to be construed as delining or limiting the scope of theinvention, the claims appended to this specification being relied uponfor that purpose.

In the drawing:

Figure l is a perspective view of a dressing or forming device forabrasive wheels to which the present invention is applicable;

Fig. 2 is a central sectional view through a linkage member of thetracing device on which the diamond dressing tools are mounted;

Fig. 3 is a side elevation of the diamonds within their retaining block;

Fig. 4 is a section of the block taken approximately on the plane ofline 4-4 of Fig. 3; and

Fig. 5 is a plan view of the block with the diamond tools in positiontherein.

In the above mentioned drawing there has been shown but one embodimentof the invention which is now deemed preferable, but it is to beunderstood that changes and modifications may be made within the scopeof the appended claims without departing from the spirit of theinvention.

The present invention relates to and is an improvement in the wheel`forming device shown in the patent to Porter et al. No. 2,469,844,granted May 10, 1949.

In the Porter et' al. patent, the forming device comprises a pantographlinkage, one member of which is provided with a tracer adapted to followthe outline of any form of desired template. Movement of this tracer'along the template surface correspondingly moves, on a greatly reducedscale, a single diamond positioned to contact the work engagingperiphery of the wheel so that this surface of the wheel will beconformed to the outline of the ternplate but upon a greatly reducedscale.

In the operation of this type of wheel dressing devices, a considerableamount of abrasive material must be removed from the wheel to originallyconform the Wheel surface to that of the template. This causes anappreciable amount of wear upon the diamond with which de vices` such asthat shown in the' Porter et al. patent are provided. It has, therefore,been proposed to mount a second diamond inalignment with the firstdiamond so that by first roughly conforming the wheel by using the iirstor roughing diamond, the work table on which the device is mounted canbe manually adjusted in the direction of its travel as shown by thearrow in Fig. 1 to properly present the second or finishing diamond tothe periphery of the wheel.

To accomplish first a roughing and then a finishing operation withseparate diamonds, it is essential that the two diamonds be accuratelypositioned vertically relative to each other, accurately aligned withthe axis about which the link on which they are mounted oscillates, and,to permit adjustment from one diamond to the other, the two diamondsalso should be aligned with the direction of movement of the table.

Referring more in detail to the figures of the drawing, and first toFig. l, it will be seen that a pantograph tracing device 10 is mountedin tixed position on the surface of a reciprocating Work supportingtable 12. The tracer 14 of the pantograph device 10 may be movedmanually along the edge of a template 16 on the tracing device, whichmovements correspondingly move a link 18 at a greatly reduced rate. Onthe link 18 are the wheel contacting diamonds 20 and 22. As the tracingdevice 10 and form of link 18 by which the diamonds are actuated andtilted form no part of the present invention, it is not thought thatfurther description of these parts will be necessary. The link 18 at itsfree end and in position to engage the surface of the wheel 24 beingformed or dressed is provided with a block 26 in which the diamond tools20 and 22 are adjustable substantially vertically by small screws 28.This positioning of the diamonds is accomplished by mounting of the twodiamonds in the block 26 generally similarly to that shown in the Porteret al. patent in which clamping or securing means 30 are provided toretain the block in position on its link 18. The block 26 itself, asshown in Figs. 3, 4 and 5, has slightly inclined openings for the spaceddiamond tool holders 20 and 22. Below the diamonds within the block areprovided the screws 28 contacting the lower ends of the diamond tools toindependently adjust the diamonds vertically within their recesses.Also, clamping means, presently to be more fully described, are providedfor securing the diamonds respectively in adjusted positions withintheir recesses.

The securing means 30 for the block 26 may be, as shown in Fig. 2, inthe form of a screw passing obliquely through an enlarged opening 31 inthe link 18. The threaded end of screw 30 enters a threaded hole in aportion of the block 26. By virtue of the opening 31 in the link 18being larger than the shank of the screw 30, the block 26 may beadjusted laterally a small distance. Also by the screw 30 the block 26may be secured in its adjusted lateral position.

To effect slight lateral adjustments of the block 26 a pivotally mountedlever 33 is mounted in the link 18. The outer end of this lever 33enters a recess formed in one side of the block 26 and the other end mayhave an adjusting screw 35 by which the lever 33 may be slightlyoscillated to laterally adjust block 26 before clamping the block inposition by means of screw 30. The above described constructioncorresponds substantially to what is shown in the patent to Porter2,601,456, granted June 24, 1952.

The first diamond 20, as shown in the figures, is mounted slightlyobliquely in a vertical plane in a cylindrical hole into which it may treadily, and may be adjusted vertically by its small screw 28 in thelower end of the block contacting the lower end of the diamond holdingtool. A clamping screw 32 contacting the tool near its upper end securesthe diamond 20 in position. The second diamond 22 is similarly mountedin a Slightly oblique hole into which it may iit, this hole beingparallel to the hole for the first diamond 20, but, as will be seen inFigs. 4 and 5, the hole for diamond 22 is not cylindrical but is greaterin diameter laterally than in the direction of movement of the table 12on which the device is mounted. Screws 34 extending horizontallywithinthe block 26 engage the diamond tool holder on opposite surfacesso that the lateral position of the diamond 22 may be accuratelyadjusted. Also, this diamond may be adjusted vertically by its screw 28within the block similar to that provided for the rst diamond. Aclamping screw 36 retains the diamond 22 in position and a similar screwalso may be used for diamond 20.

It will be seen from the above that by means of the adjusting screws 28and 34 the positions of they diamonds 20 and 22 may be brought exactlyinto alignment with the axis of oscillation of the link 18 on which theyare mounted and that the lateral position of the second diamond 22 tothe first diamond 20 may be adjusted by the opposed screws 34 engagingopposite sides of the second diamond. The adjustment of the diamonds sothat their wheel engaging points are in alignment with the axis ofoscillation of member 18 is provided so that the diamonds may beoscillated about this axis without adversely affecting the precision ofthe truing action. This feature is fully described in the patent toPorter et al. referred to above. With the diamonds 20 and 22 adjusted sothat they are in alignment with the axis of oscillation of thepantograph link member 18 and one diamond is directly behind the otherin the direction of travel of the table 12 on which the device ismounted, one diamond 20 may be used for a roughing operation and, bymovement of the table with the dressing attachment thereon an amountequal to the distance between the diamonds, the second diamond 22 may bebrought into wheel-engaging position for the final or finish formingoperation.

I claim as my invention:

1. A contourng device for abrasive wheels comprising a pantographtracing mechanism, said mechanism being mountable on the workreciprocating table of a grinding machine, a link forming part of saidtracing mechanism having a diamond receiving member removably mountedthereon, a diamond tool mounted in said member for vertical adjustment,and a second diamond tool mounted therein for vertical and obliqueadjustment, and means in said member for independently adjusting saiddiamonds, whereby said diamonds may be aligned in the axis ofoscillation of said link and in the direction of movement of said table.

2. A diamond holder for an abrasive wheel forming device comprising ablock removably mounted on a link of a pantograph tracing mechanism,means permitting oscillation of said link about an axis, said mechanismbeing mountable on the work table of a grinding machine, a diamond toolmounted in said block for adjustment toward and from said axis ofoscillation, and a second diamond tool independently mounted therein foradjustment parallel to said rst diamond and lateral adjustment, wherebysaid diamonds may be aligned in the direction of movement of said table.

References Cited in the file of this patent UNITED STATES PATENTS2,355,020 Turrettini Aug. 1, 1944 2,373,187 Johanson Apr. 10, 19452,469,844 Porter May 10, 1949 2,584,003 Engelmann Jan. 29, 1952 FOREIGNPATENTS 395,895 Great Britain July 27, 1933 617,343 Germany Aug. 16,1935

